C
C#Elio

✅ EqualityComparer

Hello, anyone know of this code work ? --> EqualityComparer<ICollection<myclass>> .Default.Equals(myclassS, x.myclassS) cause i'm wondering if this will trigger the equals override inside myclass to compare each element or if it will do an equal on the collection to look if they have the same hashcode or something like that
M
MODiX•392d ago
thinker227#5176
REPL Result: Success
class MyClass
{
    public override bool Equals(object? other)
    {
        Console.WriteLine("equals");
        return other is MyClass;
    } 
}

List<MyClass> a = new() { new() };
List<MyClass> b = new() { new() };
EqualityComparer<ICollection<MyClass>>.Default.Equals(a, b)
class MyClass
{
    public override bool Equals(object? other)
    {
        Console.WriteLine("equals");
        return other is MyClass;
    } 
}

List<MyClass> a = new() { new() };
List<MyClass> b = new() { new() };
EqualityComparer<ICollection<MyClass>>.Default.Equals(a, b)
Result: bool
False
False
Compile: 774.298ms | Execution: 95.486ms | React with ❌ to remove this embed.
T
Thinker•392d ago
It calls List<T>.Equals (in this case) EqualityComparer<T> doesn't do anything special for collections
E
Elio•392d ago
So if i want to compare 2 list i should make my own method or can i override the equals methods without creating my own List class ?
T
Thinker•392d ago
You can use SequenceEqual from Linq
M
MODiX•392d ago
thinker227#5176
REPL Result: Success
new[] { 1, 2, 3 }.SequenceEqual(new[] { 1, 2, 3 })
new[] { 1, 2, 3 }.SequenceEqual(new[] { 1, 2, 3 })
Result: bool
True
True
Compile: 456.640ms | Execution: 48.174ms | React with ❌ to remove this embed.
E
Elio•392d ago
😮 i will try right away thanks !
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